Enhanced recoater edges

ABSTRACT

An additive manufacturing device includes a build platform. A recoater is operatively connected to the build platform to move relative to the build platform to coat unfused powder onto a build on the build platform. The recoater includes a recoater mount defining a length-wise receptacle therein, and a recoater blade seated in the receptacle. A blade reel system is operatively connected to the recoater to replace the recoater blade in the receptacle during a build on the build platform.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation of U.S. patent application Ser. No. 16/258,121filed Jan. 25, 2019 the content of which is incorporated by referenceherein in its entirety.

BACKGROUND 1. Technological Field

The present disclosure relates to additive manufacturing, and moreparticularly to controlling geometries in additive manufacturingtechniques such as laser powder bed fusion, and the like.

2. Description of Related Art

Laser powder bed fusion additive manufacturing and electron beamadditive manufacturing use directed energy in conjunction with powderfeedstock to form a sintered structure. The energy source, e.g., thelaser beam or electron beam, excites the target material to the point ofphase-change. This melt-pool process, coupled with an active toolpatheffectively welds a single layer of powder feedstock into a solid state.Once one layer has been formed, a recoater pushes a thin layer of powderfeedstock across the build surface and the process repeats.

Build quality is often dependent on the state of the recoater blade,which is a wear part that has to be replaced relatively often. Somepowder metals are more abrasive than others. As a recoater bladedegrades due to friction, the recoating quality may begin to fail. Thismay be exhibited by clumps of material being dropped by the recoaterback onto the build surface. These issues can cause build failures.

The conventional techniques have been considered satisfactory for theirintended purpose. However, there is an ever present need for improvedadditive manufacturing systems and methods. This disclosure provides asolution for this need.

SUMMARY OF THE INVENTION

An additive manufacturing device includes a build platform. A recoateris operatively connected to the build platform to move relative to thebuild platform to coat unfused powder onto a build on the buildplatform. The recoater includes a recoater mount defining a length-wisereceptacle therein, and a recoater blade seated in the receptacle. Ablade reel system is operatively connected to the recoater to replacethe recoater blade in the receptacle during a build on the buildplatform.

The blade reel system can be mounted stationary relative to the buildplatform outside of a build area. The blade reel system can include areel configured to feed fresh recoater blade material into thereceptacle, replacing used recoater blade material. The blade reelsystem can include a cutter operatively connected to cut fresh bladematerial to free the recoater from the blade reel system to recoat thebuild area using the fresh blade material.

The blade reel system can be mounted to the recoater for movementtogether with the recoater relative to the build platform. The bladereel system can include a supply reel and a take up reel on oppositeends of the recoater mount. The supply reel and take up reel can beconfigured to reel blade material through the receptacle as the recoaterpasses over the build area. The supply reel and the take up reel can beconfigured to reel the blade material back and forth as the recoaterpasses over the build area.

The blade reel system can include a magazine with adequate capacity tohold a reel of recoater blade material sufficient to completely replacethe recoater blade material with each pass of the recoater over thebuild area during a build.

A method of additive manufacturing includes recoating powder over abuild area using a recoater and selectively fusing a portion of thepowder to a build in the build area. The method includes replacing arecoater blade in the recoater with the build in progress, and repeatingrecoating, selectively fusing, and replacing the recoater blade untilthe build is complete.

Replacing a recoater blade can include moving the recoater beyond thebuild area to a blade reel system. Replacing the recoater blade caninclude reeling fresh recoater blade material into a receptacle of therecoater. The method can include cutting the fresh blade material tofree the recoater to recoat the build area using the fresh bladematerial.

Replacing a recoater blade in the recoater can include moving a bladereel system together with the recoater and reeling blade materialthrough the receptacle as the recoater passes over the build area.Reeling blade material through the receptacle as the recoater passesover the build area can include reeling the blade material back andforth in the recoater receptacle as the recoater passes over the buildarea.

Replacing the recoater blade can include completely replacing therecoater blade for each recoating pass of the recoater over the buildarea.

These and other features of the systems and methods of the subjectdisclosure will become more readily apparent to those skilled in the artfrom the following detailed description of the preferred embodimentstaken in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

So that those skilled in the art to which the subject disclosureappertains will readily understand how to make and use the devices andmethods of the subject disclosure without undue experimentation,preferred embodiments thereof will be described in detail herein belowwith reference to certain figures, wherein:

FIG. 1 is a schematic plan view of an exemplary embodiment of anadditive manufacturing device constructed in accordance with the presentdisclosure, showing a blade reel system that is stationary relative tothe build platform;

FIG. 2 is a schematic perspective view of a portion the device of FIG. 1, showing the recoater blade material seated in the receptacle of therecoater mount; and

FIG. 3 is a schematic plan view of another exemplary embodiment of anadditive manufacturing device constructed in accordance with the presentdisclosure, showing a blade reel system that is mounted for movementtogether with the recoater relative to the build platform.

DETAILED DESCRIPTION

Reference will now be made to the drawings wherein like referencenumerals identify similar structural features or aspects of the subjectdisclosure. For purposes of explanation and illustration, and notlimitation, a partial view of an exemplary embodiment of an additivemanufacturing device in accordance with the disclosure is shown in FIG.1 and is designated generally by reference character 100. Otherembodiments of additive manufacturing devices in accordance with thedisclosure, or aspects thereof, are provided in FIGS. 2-3 , as will bedescribed. The systems and methods described herein can be used toimprove build quality in additive manufacturing processes such as laserpowder bed fusion (LPBF).

The additive manufacturing device 100 includes a build platform 102 aportion of which is a build area 104 for additively manufacturing a part106. A recoater 108 is operatively connected to the build platform 102to move relative to the build platform 102 to coat unfused powder onto abuild, e.g., the part 106 in progress, on the build platform 102.

With reference now to FIG. 2 , the recoater 108 includes a recoatermount 110 defining a length-wise receptacle 112 therein. A recoaterblade 114 is seated in the receptacle 112. The recoater blade 114 is ofa relatively soft material for soft-recoater additive manufacturing. Forexample, polymeric 0.25 inch (6.35 mm) O-ring stock material, or anyother suitable material can be used. The recoater mount 110 is of arelatively hard material, such as stainless steel, tungsten carbide,nylon 12, or the like.

Referring again to FIGS. 1 and 2 a blade reel system 116 is operativelyconnected to the recoater 108 to replace the recoater blade 114 (shownin FIG. 2 ) in the receptacle 112 during a build on the build platform102. The blade reel system 116 is mounted stationary relative to thebuild platform 102 outside of the build area 104. The blade reel system116 includes a first feed reel 118 configured to feed fresh recoaterblade material 120 (shown in FIG. 2 ) into the receptacle 112, replacingused recoater blade material 122 as the fresh recoater blade material120 is reeled in the direction F into the receptacle 112. A first uptake reel 124 is included opposite the first feed reel 118 for taking upthe used recoater blade material 122. The blade reel system 116 includesa cutter and loader 126 operatively connected to remove used recoaterblade material 122 (shown in FIG. 2 ), load the fresh blade material 120in place, and cut it after it is loaded into the receptacle 112 to freethe recoater 108 from the blade reel system 116 so the recoater 108 canrecoat the build area 104 using the fresh blade material 120.

As shown in FIG. 1 , the recoater 108 is shown recoating the build area104 while approaching the first feed reel 118 and up take reel 124. Theblade reel system 116 optionally includes a second feed reel 128 and asecond up take reel 130 at an opposite end of the build area 104 fromthe first feed reel 118 and first up take reel 124. After the first feedreel and uptake reel 118, 124 replace the recoater blade 114, therecoater 108 can approach the second feed and up take reels 128, 130,which similarly replace the recoater blade 114 and cut the recoater 108loose with a cutter 132. In this manner, the recoater 108 can recoat thebuild area 104 with each pass in ether recoat direction R, as indicatedwith the large double arrow in FIG. 1 . Each pass can use a freshrecoater blade 114. As the recoater 108 is reloading at the blade realsystem 116 at either end of the build area, the laser 134 canselectively fuse part of the last layer of powder from recoating to thepart 106.

With reference now to FIG. 3 , another exemplary embodiment of a bladereel system 216 is shown. The blade reel system 216 is mounted to therecoater 108 for movement together with the recoater 108 relative to thebuild platform 102. The blade reel system 216 includes a supply reel 218and a take up reel 214 on opposite ends of the recoater mount 110. Thesupply reel 218 and take up reel 214 are configured to reel bladematerial 120 through the receptacle 112 (as shown in FIG. 2 ) as therecoater 108 passes over the build area 104. This movement can beintermittent or continuous as needed to maintain a fresh recoater blade114. It is also contemplated that the supply reel 218 and the take upreel 214 can reel the blade material 120 back and forth in the directionF as the recoater 108 passes over and recoats the build area 104.

Each of the reels 118, 124, 128, 130, 218, 214 of FIGS. 1 and 2 caninclude a spool magazine 136 with adequate capacity to hold a reel ofrecoater blade material 120 sufficient to completely replace therecoater blade material 120 with each pass of the recoater 108 over thebuild area 104 during a build. Some applications may not need completereplacement of the recoater blade material 120 with each pass, in whichcase less frequent replacement can be used. This system allows forreplacement of the blade material 120 during a build each time it therecoater blade 114 becomes degraded to a point where further use wouldrisk a build failure.

A method of additive manufacturing includes recoating powder over abuild area (e.g. build area 104) using a recoater (e.g. recoater 108)and selectively fusing a portion of the powder to a build in the buildarea as indicated schematically in FIGS. 1 and 3 with the laser 134. Themethod includes replacing a recoater blade (e.g. recoater blade 114) inthe recoater with the build in progress, and repeating recoating,selectively fusing, and replacing the recoater blade until the build iscomplete (e.g., until part 106 is finished).

The methods and systems of the present disclosure, as described aboveand shown in the drawings, provide for additive manufacturing withsuperior properties including reduced build failures and more consistentbuild properties and quality throughout a build due to a fresh recoaterblade replenished on the fly during builds. While the apparatus andmethods of the subject disclosure have been shown and described withreference to the exemplified embodiments, those skilled in the art willreadily appreciate that changes and/or modifications may be made theretowithout departing from the scope of the subject disclosure.

What is claimed is:
 1. An additive manufacturing device comprising: abuild platform; a recoater operatively connected to the build platformto move relative to the build platform to coat unfused powder onto abuild on the build platform, wherein the recoater includes a recoatermount defining a length-wise receptacle therein, and a recoater bladeseated in the receptacle; and a blade reel system operatively connectedto the recoater to replace the recoater blade in the receptacle during abuild on the build platform, wherein the blade reel system includes afirst supply reel and a first take up reel, and a second supply reel anda second take up reel on an opposite end of the build area from thefirst feed reel and the first take up reel, wherein the blade reelsystem is mounted stationary relative to the build platform outside of abuild area, wherein each of the first supply reel and the second supplyreel are configured to feed fresh recoater blade material into thereceptacle, replacing used recoater blade material, wherein the bladereel system includes a cutter operatively connected to cut fresh bladematerial to free the recoater from the blade reel system to recoat thebuild area using the fresh blade material.
 2. The device as recited inclaim 1, wherein the respective first and second feed reels are onopposite ends of the recoater mount from the respective first and secondtake up reels.
 3. The device as recited in claim 1, wherein the bladereel system includes a magazine with adequate capacity to hold a reel ofrecoater blade material sufficient to completely replace the recoaterblade material with each pass of the recoater over the build area duringa build.